Post-traumatic subtalar osteoarthritis: which grading system should we use? - Muinck Keizer, Robert-Jan; Backes, Manouk; Dingemans, Siem; Goslings, J.; Schepers, Tim; de Muinck Keizer, Robert-Jan O; Dingemans, Siem A; Goslings, J Carel (International Orthopaedics, 2016)